Electric shaver

ABSTRACT

An electric shaver is provided which can enhance the vibration sound by increasing the length of arch-like edges formed between adjacent slots of the inner blade. In the electric shaver, an inner blade having the arch-like edges is moved reciprocally while its outer face contacts with and slides over an inner face of an outer blade to cut beard. The inner blade has an arch-like plate member, as a main body of the inner blade, and it has slots extending from a side wall through a top curved portion to the other side wall, to form arch-like edges between adjacent slots, and the inner blade is connected through a joint to a driver of the main body to be moved reciprocally. Mounting members for the joint are provided at two ends of the inner blade in the longitudinal direction, and the lower ends of the edges at the central portion of the inner blade are set lower than the lower ends of the beads formed above the mounting members of the inner blade.

TECHNICAL FIELD

The invention relates to an electric shaver for cutting beard by slidingan inner blade over an outer blade.

BACKGROUND ART

In a prior art electric shaver, an inner blade having slots performs areciprocating motion while sliding over an outer blade to cut beardbetween them (for example, Japanese Patent laid open PublicationH7-250979). A plate sheet, as a main body of the inner blade, has anarch-like (or of inverse-U-character-like) section in a directionperpendicular to the longitudinal direction thereof, and it has aplurality of the slits in parallel to each other, extending from a sidewall through the top curved portion to another side wall. An arch-likeedge is formed between two adjacent slits, and the edge of the curvedportion is a cutting edge. The outer blade is formed so that its innerface makes contact with and slides over an outer face of the innerblade. The outer blade is mounted to a main body of the electric shaver,while the inner blade is connected via a joint to a driver at the top ofthe main body. The inner blade fixed to the joint so that the outerplane thereof is provided along the inner face of the outer blade, andthe joint to which the inner blade is fixed is connected to the driverat the top of the main body, and it is driven so that the longitudinaldirection of the inner blade agrees with the direction of thereciprocating motion of the driver. The above-mentioned prior art innerblade has fixing members to the joint at the bottom end at the centralportion in the longitudinal direction of the two side walls of thearch-like inner blade.

Some of such electric shavers generate a cutting sound due to vibrationsof the edges of the inner blade when the inner and outer blades bite andcut beard between them. The cutting sound or vibration sound of theedges is used to judge the shaving state of beard. In order to judge theshaving state better, the vibration sound might be enhanced byincreasing the length of the edges. However, when the fixing members tothe joint are provided at the central portion in the longitudinaldirection, the lower end of the edges at the central portion cannot beextended lower due to interference of the fixing portions, and thelength of the edges cannot be increased. Therefore, the length of theedges cannot be increased as far as the height of the generallyU-character-like inner blade is not increased.

The invention intends to solve this problem, and its object is toprovide an electric shaver which can enhance the vibration sound byincreasing the length of the arch-like edges formed between adjacentslots of the inner blade.

DISCLOSURE OF INVENTION

It is an object of the invention to provide an electric shaver which canenhance the sound due to the cutting of beard by increasing the lengthof the arch-like edges formed between adjacent-slots of the inner blade.

An electric shaver according to the invention has an inner blade (1)with slits (12) in reciprocating motion, so that its outer face contactswith and slides over an inner face of an outer blade (20) for cuttingbeard. The electric shaver includes a driver (41) provided at an end ofa main body, being able to perform a reciprocating motion, a joint (3)connected to the driver (41), the inner blade (1) with the slits, andthe outer plate (20) in contact with and sliding over the outer face ofthe inner blade (1). The inner blade (1) has a plate member (12) with anarch section in a direction perpendicular to a longitudinal direction ofthe plate member (12) and mounting members provided at two ends of theplate member in the longitudinal direction and being connected with thejoint (3). The outer blade (20) is supported by the main body and has aninner space to contain the inner blade (1), wherein its inner facecontacts with and slide over an outer face of the inner blade (1). Theplate member (11) of the inner blade (1) has arch-like slits (12)provided in parallel to each other to form arch-like edges (14) betweenadjacent slits (12). A bottom end (15 a) of edges (14 a) formed at acentral portion of the plate member in the longitudinal direction islower than a bottom end (15 b) of other edges (14 b) near the mountingmember when a top of the arch-like section of the plate member (11) isviewed high and the driver is viewed low. Thus, as to the inner blade(1) which needs to provide the fixing members to the joint (3), thefixing members (16) are provided at side walls (11 a) at the lower sideof the edges (14 a) at two ends in the longitudinal direction of theinner blade (1) which is not likely be used for cutting beard, whileincreasing the length of edges (14 a) at the central portion usedfrequently for cutting beard. Thus, the sound on cutting beard can beenhanced effectively, so that the cutting state can be judged well.

Preferably, the bottom end (15 a) of the edges (14 a) formed at acentral portion of the plate member in the longitudinal direction islower than a top end of the mounting member (16) of the plate member.Then, the length of the edges can be longer at the central portion inthe longitudinal direction.

Preferably, a position of the bottom end (15 a) of a plurality of theedges (14 a) formed at the central portion of the inner blade (1) is notconstant in the up-and-down direction. Thus, the sound due to cuttingcan be enhanced, while suppressing the deterioration of cutting propertydue to decrease in rigidity.

Preferably, a position of the bottom end (15 a ₁, 15 a ₂) is differentin the up-and-down direction between adjacent edges (14 a ₁, 14 a ₂) ina plurality of the edges (14 a) formed at the central portion. Thus,deterioration of cutting property can be suppressed by providing longeredges (14 a) continuously.

Preferably, the driver (41) has a transmission member which transmitsreciprocal motion to the joint (3) provided in the inner blade. Thus,the electric shaver can be fabricated compactly without increasing theheight of the inner blade (1) with the longer edges (14).

Preferably, a member (36) for preventing detachment of the driver (41)from the joint (3) is provided further inside the inner blade (1). Thus,the electric shaver can be fabricated compactly without increasing theheight of the inner blade (1) having the longer edges (14).

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a perspective exploded view of an inner blade and a joint ofan electric shaver according to an embodiment of the invention.

FIG. 2 is a perspective view of the inner blade fixed to the joint withparts broken away.

FIG. 3 is an elevation view of the inner blade fixed to the joint.

FIG. 4 is a side view of the inner blade fixed to the joint.

FIG. 5 is a perspective exploded view of the electric shaver with partsbroken away partially.

FIG. 6 is a perspective exploded view of an inner blade and a joint ofan electric shaver according to another embodiment of the invention.

FIG. 7 is a perspective view of the inner blade fixed to the joint withparts broken away.

FIG. 8 is an elevation view of the inner blade fixed to the joint.

FIG. 9 is a side view of the inner blade fixed to the joint.

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiments of the invention will be explained below with reference tothe attached drawings.

First, the entire structure of an electric shaver according to a firstembodiment is explained with reference to FIG. 5. The electric shavermainly consists of an outer blade cassette 2 and a main body 4 of theelectric shaver. The outer blade cassette 2 has two outer blades 20,while the main body 4 has drivers 41 at the top end thereof, joints 3and two inner blades 1 being mounted on the drivers 41. When the driversare moved reciprocally, an outer face of the inner blade 1 contacts withand slides over an inner face of the outer blade 20.

The outer blade cassette 2 is explained here. An outer frame thereof hastwo float supporters 21 provided at two sides when viewed in theback-and-forth direction and a slit supporter 22 located between thefloat supporters 21. A net blade cassette 23 has the net-like outerblades 20 at the top of the two float supporters 21. A slit bladecassette 25 has the outer blades 20 and a slit blade 24 at the top ofthe slit holder 22. Therefore, the outer blades 20 are provided at twoends in the back-and-forth direction, and the slit blade 24 is providedbetween the two outer blades 20. The outer blade cassette 2 is connectedto the top of the main body 4 so that it has the float supporters 21 andthe slit holder 22 (outer frame) floatable or movable in thetop-and-bottom direction and tiltable in the longitudinal direction. Thetwo outer blades 20 of the outer blade cassette 2 correspond to theinner blades 1 of the main body 4.

The main body 4 of the electric shaver houses reciprocal drivers (notshown) such as a linear motor and an electric power supply such as abattery (not shown) for driving the reciprocal drivers in a grip case 40used as an outer frame, and it has a switch 42 for turning on or off thepower supply at an outer plane of the grip case 40. In the explanationof the electric shaver, “front” means the side wherein the switch 42 isprovided, and “rear” means the side opposite to the front. Further, the“up-and-down direction” means a direction where the outer blade cassette2 is up and the main body 4 is down.

At the top of the main body 4, two drivers to be driven reciprocally areprovided at the front and rear sides in the reciprocal drivers. The twodrivers 41 are provided at positions in correspondence to the two outerblades 20 mentioned above. Further, a lever 43 for slit driving is addedto one of the drivers at a position in correspondence to the slit blade24.

The bottom ends of the bases (not shown) of the drivers 41 are connecteddirectly or indirectly to the reciprocal driver in the grip case 40. Atthe top of the base of the drivers 41, two engaging members 44 protrudeupward at the right and left sides, and an engaging pin 45 protrudingupward is provided between the two engaging members 44. The drivers 41are connected to the joints 3 to which the inner blades 1 are fixed.

The inner blades 1 and the joints 3 are explained here. FIG. 1 is aperspective exploded view of the inner blade 1 and the joint 3, whileFIGS. 2 and 3 are a perspective view with parts broken away and anelevation view in a state where the inner blade and the joint are fixed,respectively. As shown in FIGS. 1 to 3, the inner blade 1 has a platesheet 11 curved like an arch (or in an inverse-U-character-like) whenviewed in a side way (or in the longitudinal direction). (Therefore, asection of the plate sheet 11 is arch-like in a direction perpendicularto the longitudinal direction.) The plate sheet 11 is curved to form acurved plane having an arch-like curved wall (a wall curved to protrudein the upward direction) between two side walls arranged in parallel,and it is open at the bottom. The plate sheet 11 has a plurality ofslits 12 in parallel to each other in the longitudinal directionextending from the side wall 11 a through the curved wall 11 b to theother side wall 11 a, and an arch-like portion between two adjacentslits forms an edge 14. When the inner blade 1 is moved reciprocally inthe longitudinal direction thereof, the edges of the blade 14 in thewidth direction at the curved portion (or in the longitudinal directionof the inner blade 1) become cutting edges. The two bottom ends 15 ofthe edge 14 extend to the side walls 11a of the plate sheet 11.

The inner blade 1 has fixing members 16 for fixing to the joints 3 attwo positions at each of the bottom ends of the two ends of the sidewalls 11 a in the direction of the reciprocal motion (or in thelongitudinal direction) for each of the two inner blades 1. The fixingmember 16 is subjected to heat sealing with a boss 35 of the joint 3 tobe mentioned below, and it has a boss hole 16 a opened at the lower sideof the side wall 11 a and thin pieces 16 b protruding from a brim of thehole 16 a into the hole 16 a. The boss hole 16 a is formed to have anopening somewhat wider than the boss 35 in order to insert the boss 35from the opening at the lower end. Further, the pieces 16 b thinner thanthe plate sheet 11 protrude from an end of the brim at the interior side(or at the inner side in a plan view) of the hole 16 a. Four thin pieces16 a or two pairs of the thin pieces 16 b are provided above and below,wherein the distance between top ends of the opposing two pieces 16 b inthe longitudinal direction of the inner blade 1 is somewhat larger thanthe size of the boss 35 and of about the same order as the opening widthof the boss hole 16 a.

Further, each of the inner blades 1 has four square recesses 17 forpositioning relative to the joints 3 at the lower ends of the two endsof the two side walls 11 a in the direction of the reciprocating motion(or in the longitudinal direction) of the inner blade 1. The squarerecesses 17 are provided between the fixing members 16 mentioned abovein this embodiment. The square recesses 17 fit with square projectionsfor positioning to be mentioned below, and they are rectangular and areopen towards the lower end of the side wall 11 a.

Further, the inner blade 1 has four square windows for each inner blade1 for preventing detachment from the joints 3, at the two ends of thetwo side walls 11 a of the inner blade 1 in the direction of reciprocalmotion (or in the longitudinal direction). In this embodiment, thesquare windows 18 are provided above the fixing members 16 at theoutside of the side walls (or at the outside in the longitudinaldirection). The square window 18 has a generally rectangular opening,and it engages with the engaging member 34 of the joint 3 to beexplained later for preventing detachment.

Next, the joint 3 is explained. As shown in FIGS. 1 to 3, the joint 3 isfitted along the inner lower face of the arch-like inner blade 1, and ithas a similar shape to the inner blade in a plan view (or moreprecisely, smaller by the thickness of the plate sheet 11 of the innerblade 1. Further, its height in the up-and-down direction is alsosimilar to that of the inner blade 1 at the two ends in the longitudinaldirection, and it has the fixing member 30 for the main body whichprotrudes lower than the inner blade at the central portion in thelongitudinal direction.

The joint 3 has a float square hole 31 which is generally rectangularand is open through in the up-and-down direction. The float square hole31 is provided inside the fixer 30 mentioned above, so that the fixer 30has a shape of a generally cylindrical square.

First, the connection with the inner blade 1 and portions relevant tothe connection are explained. The joint 3 is fitted and fixed by beingcovered by the lower opening of the inner blade 1 to be fitted along theinner lower face of the inner blade 1. Because the front and rear facesof the joint 3 fit to the inner face of the two side walls 11 a of theinner blade 1, positioning thereof is not needed in the back-and-forthdirection. As to the up-and-down direction, it is only needed to insertthe inner blade 1 until the lower face of the top of the curved wall 11b of the inner blade 1 contacts with the top of the joint 3. In thisembodiment, receptors 32 for the inner blades 1 are provided at the topends of the two ends in the longitudinal direction of the joint 3, andthey contact with the lower faces of the tops of the curved walls 11 bof the inner blades 1 for positioning in the up-and-down direction.Further, as to the positioning in the longitudinal (left-and-right)direction, the square recesses 17 mentioned above are provided in theinner blade 1, and square protrusions 33 are provided in the joint 3 atpositions to fit with the square recesses 17 of the inner blades 1 whenthe inner blades 1 are fixed to the joints 3. The square recesses 17 andthe square protrusions 33 are used for the positioning. The squareprotrusion 33 has a generally rectangular shape similar to therectangular recess 17, and it protrudes towards the outside in theback-and-forth direction. When it is inserted into the square recess 17from below, the positioning in the left-and-right direction isperformed. The inner blades 1 and the joints 3 are positioned and fixedin this way while preventing detachment.

The detachment is prevented by the engaging member 34 to be engaged withthe square window 18 of the inner blade 1 mentioned above. The engagingmember 34 has a hook 34 a provided at a position in correspondence tothe square window 18 in the engaged state, and the hook 34 a protrudestowards the outside in the back-and-forth direction. When the joint 3 isfit to the inner blade 3, the hook 34 a is pressed to the side wall 11 aof the inner blade 1 to be fit inwardly to the joint 3 elastically, andwhen the square window 18 is positioned, it is inserted through thesquare window 18 and protrudes due to a returning force towards theoutside. Thus, the engaging member 34 is engaged at the lower inner brimof the square window 18 to prevent detachment of the inner blade 1 fromthe joint 3.

The inner blade 1 is fixed with the joint 3 while performing thepositioning and the prevention of the detachment. The fixing isperformed by heat sealing with the heat seal boss 35 of the joint 3 tothe fixing member 16 of the inner blade 1 mentioned above. The boss 35is cylindrical, and it is provided at a position in correspondence tothe fixing member 16 of the inner blade 1 in the fixed state, protrudingtowards the outside in the back-and-forth direction. The boss 35 isfixed by heat sealing in a state wherein it is crimpled to the outerface of the thin protrusion 16 b and to the outer face of the side wall11 a of the inner blade 1 so that the inner blade 1 is connected to thejoints 3 as an integral body.

The joint 3 has a member 36 for preventing detachment of the driver 41from the joint 3 to protrude towards the float square hole 31 at thelower end of the fixing member 30, and a cylindrical member 37 to beengaged as a pin connection inside the float square hole 31. When theengaging member 44 of the driver 41 is inserted from below into thefloat square hole 31 for the connection, the top of the engaging member44 contacts to the top face of the detachment-preventing member 36 so asfor the joint 3 not to be detached from the engaging member 44. In theengaged state, the joint 3 is spring-loaded upward to prevent thedetachment from the engaging member 44. For creating the spring loading,a coil-like spring 46 is put on an engaging pin 45 of the driver 41 fromabove, and a plate-like stopper 47 is provided at a top end of thespring 46. Then, the float square hole 31 of the driver 41 is coveredover the engaging pin 44 of the driver 41, and the stopper 47 isprovided at a top end of the spring 46. Further, the float square hole31 of the joint 3 is covered over the engaging member 44 of the driver41, and the stopper 47 is pushed down to cover the cylindrical member 37of the joint 3 over the pin 45 of the driver 41 provided at the top endof the spring 46. Then, as mentioned above, the engaging member 44 ofthe driver 41 is fixed to the detachment-preventing member 37 of thefloat square hole 31 of the joint 3. The stopper 47 contacts with thebottom end of the joint 3 to exert an upward force, so that the joint 3to which the inner blade 1 is fixed is floatable relative to the driver41.

Further, the joint 3 has holes 38 at the two sides of the float squarehole 31 in the longitudinal direction, and the holes 38 go through inthe up-and-down direction to drop beard. Still further, a plurality ofuneven patterns are formed at the two sides in the longitudinaldirection to form holders 39 used for holding the joint 3.

As mentioned above, the inner blade 1 has slits 12 along the entirelength in the direction of reciprocal motion (or in the longitudinaldirection) to form edges 14. Because the fixing members 16, the squarerecesses 17 and the square windows 18 are formed at the two ends in thedirection of reciprocal motion, the bottom ends 13 of the slits 12 (andthe bottom ends 15 b of the edges 14 b) at the two ends in the directionof reciprocal motion of the inner blade 1 are formed at an upperposition than the bottom ends 13 of the slits 12 (and the bottom ends 15a of the edges 14 b) provided at the central portion in the direction ofreciprocal motion of the inner blade 1. Therefore, the length of theedges is set so that the edges 14 a at the central portion are longerthan the edges 14 b at the two ends in the direction of reciprocalmotion.

When beard is caught and cut off with the inner and outer blades 1, 20,the edges 14 of the inner blade 1 vibrate to create a cutting sound (ora vibration sound of the edges 14), and the sound makes it possible todecide the shaving state. In this embodiment, in order to decide theshaving state well, the length of the edges 14 is formed longer toenhance the vibration sound of the edges 14. Because the inner blade 1needs the fixing members 16 for mounting the joint 3, if all the edges14 are longer, there is no space for providing the fixing members 16.Therefore, in this embodiment, the positions of the fixing members 16are provided not at the central portion of the inner blade 1, but at thetwo ends in the longitudinal direction, and the edges at the centralportion become longer. When the beard is cut off, the portion of theedges 14 a at the central portion in the direction of reciprocal motionis easily applied to skin. Further, because the inner blade 1 and theouter blade 20 are moved relatively to each other reciprocally in thelongitudinal direction, the edges 14 a at the central portion alwayscontribute to cut off beard, or the edges 14 a at the central portion isused most frequently. Then, only the edges 14 a at the central portionare lengthened to enhance the cutting sound effectively.

In the above-mentioned structure, the fixing members 16 for the joint 3are provided at the side walls 11 a below the edges 14 b at the two endsin the longitudinal direction of the inner blade 1 not used so often forcutting beard, while the length of the edges 14 a at the central portionis set longer. Thus, the sound for cutting beard can be enhancedeffectively to decide the cutting status well.

Further, in this embodiment, the lower ends 15 a of the edges 14 a atthe central portion in the longitudinal direction are extended lowerthan the lower ends 15 b of the edges 14 b at the two ends in thelongitudinal direction, so that the lower ends 15 a are lower than thetop ends of the fixing members 16. Thus, the length of the edges 14 a atthe central portion is increased still longer.

Still further, in this embodiment, the positions of the lower ends 15 aof the edges 14 a at the central portion in the longitudinal directionare different or the lengths of the edges are different. As to thelength of the edges, it is preferable to be longer as far as possible inorder to enhance the cutting sound, but as to the cuttingcharacteristic, the edge becomes dull due to large deflection on cuttingwhen the blade length is longer. Therefore, in order to suppress thedull edge while enhancing the cutting sound, the edges 14 a at thecentral portion has two or more lengths, for example, a shorter lengthand a longer length, in order to prevent decrease in rigidity due toincrease in length of the edges 14 a. Then, the cutting sound is keptlarge while the, dull edge due to decrease in rigidity can be prevented.Especially, because the positions of the lower ends 15 a 1 and 15 a 2 inthe up-and-down direction of adjacent edges 14 a 1 and 14 a 2 arechanged to have non-constant lengths of the edges, the longer edges 14 aare not arranged continuously. Thus, the decrease in edge dullness dueto continuous arrangement of longer edges 14 a can be suppressed. Inthis embodiment, as shown in FIG. 3, there are three types of edges,that is, edges 14 a 1 between two slits 12 a, edges 14 a 2 between twoslits 12 a and 12 b, and edges 14 a 3 between two slits 12 b, whereinthe length of the edges 14 a 1>length of the edges 14 a 2>length of theedges 14 b.

Next, a second embodiment of the invention is explained with referenceto FIGS. 6 to 9; This embodiment is generally similar to the firstembodiment shown in FIGS. 1 to 5, and like reference charactersdesignate like structures and explanation thereof is omitted here.Different points are explained below mainly.

In the second embodiment, the joint 3 is different from the counterpartin the first embodiment. In the first embodiment, the members 30 forfixing to the main body extend lower than the inner blade 1 at thecentral portion in the longitudinal direction of the joint 3, while inthis embodiment, no members are provided extending lower than the innerblade 1.

That is, a float square hole 31 is formed through the center of thejoint 3 in the longitudinal direction, and the lower end of the floatsquare hole 31 is not lower than the two ends of the joint 3 in thelongitudinal direction. At the lower end of the hole 31, a member 36 forpreventing detachment is protruded towards the inside of the hole 31,while a cylindrical member 37 for pin engagement is arranged in the hole31.

Thus, an engaging member 44 of the driver 41 to be connected to thejoint 3 is not lower than the inside of the fixing member 30 or the twoends of the joint in the longitudinal direction, in contrast to thefirst embodiment, and it is provided inside the joint 3 (and between theside walls 11 a of the inner blade 1). Further, the member 36 forstopping detachment is not lower than the two ends of the joint 3 in thelongitudinal direction similarly, and it is arranged inside the joint 3(and between the side walls 11 a of the inner blade 1). Therefore, theedges 14 becomes longer, while the arch-like curved wall of the innerblade 1 is not made higher and the electrical shaver is kept compact.

Though the invention is explained above with reference to theembodiments, but the invention can be changed or embodied in still otherways without departing from the essential character thereof.

1. An electric shaver wherein an inner blade with slots is moved reciprocally and its outer face contacts with and slides over an outer blade for cutting beard, the electric shaver comprising: a driver provided at an end of a main body, being able to perform a reciprocating motion; a joint connected to said driver; said inner blade having a plate member with an arch section in a direction perpendicular to a longitudinal direction of the plate member and mounting members provided at two ends of the plate member in the longitudinal direction and being connected with said joint; and said outer blade supported by the main body and having an inner space to contain said inner blade, wherein its inner face contacts with and slide over an outer face of said inner blade to cut beard when said inner blade connected to said joint is moved by said driver in reciprocating motion; wherein the plate member of said inner blade has arch-like slits provided in parallel to each other to form arch-like edges between adjacent slits; and wherein a bottom end of edges formed at a central portion of the plate member in the longitudinal direction is lower than a bottom end of different edges formed near the mounting member when a top of the arch-like section of the plate member is viewed high and said driver is viewed low.
 2. The electric shaver according to claim 1, wherein the bottom end of the edges formed at a central portion of the plate member in the longitudinal direction is lower than a top end of the mounting members of the plate member.
 3. The electric shaver according to claim 1, wherein a position of a plurality of the edges formed at the central portion is not constant in the vertical direction.
 4. The electric shaver according to claim 1, wherein a position of the bottom end is different between adjacent edges in a plurality of the edges formed at the central portion.
 5. The electric shaver according to claim 1, wherein said driver has a transmission member which transmits reciprocal motion to said joint provided in said inner blade.
 6. The electric shaver according to claim 1, further comprising a member for preventing detachment of said driver from said joint in said inner blade.
 7. The electric shaver according to claim 2, wherein a position of a plurality of the edges formed at the central portion is not constant in the vertical direction.
 8. The electric shaver according to claim 2, wherein a position of the bottom end is different between adjacent edges in a plurality of the edges formed at the central portion.
 9. The electric shaver according to claim 2, wherein said driver has a transmission member which transmits reciprocal motion to said joint provided in said inner blade.
 10. The electric shaver according to claim 2, further comprising a member for preventing detachment of said driver from said joint in said inner blade.
 11. The electric shaver according to claim 3, further comprising a member for preventing detachment of said driver from said joint in said inner blade.
 12. The electric shaver according to claim 3, wherein said driver has a transmission member which transmits reciprocal motion to said joint provided in said inner blade.
 13. The electric shaver according to claim 4, wherein said driver has a transmission member which transmits reciprocal motion to said joint provided in said inner blade.
 14. The electric shaver according to claim 4, further comprising a member for preventing detachment of said driver from said joint in said inner blade.
 15. The electric shaver according to claim 5, wherein said driver has a transmission member which transmits reciprocal motion to said joint provided in said inner blade.
 16. The electric shaver according to claim 5, further comprising a member for preventing detachment of said driver from said joint in said inner blade.
 17. The electric shaver according to claim 6, wherein said driver has a transmission member which transmits reciprocal motion to said joint provided in said inner blade.
 18. The electric shaver according to claim 6, further comprising a member for preventing detachment of said driver from said joint in said inner blade.
 19. The electric shaver according to claim 7, further comprising a member for preventing detachment of said driver from said joint in said inner blade.
 20. The electric shaver according to claim 8, further comprising a member for preventing detachment of said driver from said joint in said inner blade. 